Alfa Laval AquaFirst
Installation, service and operating instruction
25
7.6
Safety Function
This function activates the four pumps' power relays at the same time without considering ipsothermic contacts'
inputs.
NOTE:
This function can be enabled from base access level.
In case of high temperature alarm on S1, the primary pumps are stopped, even if the function is
activated.
7.7
Eco-Booster Function
One or both functions can be activated at the same time.
•
ECO
: When control valve is sufficiently closed (Valve Hysteresis) during a sufficient long time (ECO
delay), primary pump switches off and primary mixing valve close down.
The system is switch ON when S1 temperature has gone down more than the set value of
”Eco Hysteresis”.
If secondary pumps are connected (SS/DS/DD series) they are still in operation during the Eco
function.
•
Booster
: If DHW temperature is dropping down faster than "Booster Gradient", the second primary
pump (if existing) is energized, to increase the primary flow rate. Function stops when DHW
temperature is back to the setpoint value and after "Booster Delay" parameter.
Parameter
Factory Setting
Optional setting
Description
0:-
1:E
2:B
3:E+B
0
0/1/2/3
0 = No function
1 = Eco Function only
2 = Booster function only
3 = Accumulated two functions
Fct_Selection
Normal
Normal/Eco/Boost/
EcoBoost
Playback function selected in
1:Eco 2:Booster 3:ECoBoost
Eco Delay
5 min
1-30 min
Scan time before activating function if
possible
Eco Hysteresis
5°C
1-20°C
Temperature range in which the function is
applicable
Valve Hysteresis.
10%
0-80%
Maximum opening of the valve before
switching function
Booster Delay
2 sec
2-200 sec
Time delay between the Booster functions
stops and the second pump stops
Booster Gradient
2°K/s
1 to 20°K/sec
Minimum temperature fall speed at which
the function operates
Parameter
Factory Default Setting Optional Setting
SAFETY_Speed
75%
Not used
SAFETY FCT
Off
Off/On
